Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc10f23f6d0c60d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6c3ba7ba20f08a72cbbcdb59ba03cf9 SHA-1: 19a656528813164839b5b4c3b6647f879165bfa8 SHA-256: dcc10f23f6d0c60d4236f7bd1be74a43e59281275f2e6d15b89d6f6c20f156bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://autodilykanka.cz/cmsimple/images/file/94439302909.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u03c0ni9vkf4uaha10f00um1hc/fimeporexadimusiti.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/palixaluniguk.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/alemif7p3495fl3gdjesdtine1/sunixuwuvubekafigolupon.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ritewokegarasulonepanu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/29469657619.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/noluxajovoguvujofojupi.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/62125271532.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf97182f44---75834392488.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/99998141603.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bef1463c0---31100774506.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/93643938064.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/24466670001.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/61435847194.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/rexiboziweradutovurazabaf.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jomiwurunolosilojubegufip.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/9723114512.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a21daecafb6e870d61dda7095feeccad/79157746760.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/jumafinatajage.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/kezofu.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/93230000083.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dl3iapgofru5c7b8vubsolu3v2/masivu.pdfIn PDF document text
    • http://dges.in/userfiles/file/nojawilobumipefeliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pleasure+p+did+you+wrong+free+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 18256 bytes
SHA-256: a52e562c68743d09def3565786cdb8ce06b1e7b0eab920f606e7397d3bb042f8
font_02_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 11216 bytes
SHA-256: 83ff4d6f4a8ce868ff04e40f56e61e3b6ca185b215f1ac8fb8f4ced9a4558d04

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